<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>情报管理</title>
</head>
<style>
    *{
        padding: 0;
        margin: 0;
    }

    body{
        width: 883px;
        margin: 0 auto;
    }
    #redblock{
        text-align: center;
        display: table-cell;
        vertical-align: middle;
        width:auto;
        height: 530px;

    }

    img{
        max-width: 100%;
        max-height: 100%;

    }
</style>
<body>
<div id="redblock">
    <img src="../img/back.jpeg" height="530px" width="auto">
</div>
</body>
</html>